I'm going to respond to this, because not only does it look like some people are ganging up on the bride, but because I can totally understand.
Raise your hand if any of you have imagined your wedding day since you were a little girl. Now imagine someone standing in your photos that looks like they have very unclean habits. (I can only imagine how lovely a foot-long beard will look in those pictures.)
Instead of saying she shouldn't take away someone else's bodily freedom, she's just asking what we think. She's not asking him to chop it off for her wedding.
I'm going to say the following, without a disclaimer- because I totally and completely believe this.
It does matter how you present yourself to the world, and it's selfish to not think of others when you make life decisions.
That being said- it's a beard. It's not a tattooed face, or piercings all over. But when she stands next to her husband who is standing next to her man- it's completely acknowlegeable that she may be uncomfortable that everyone is looking at a foot-long beard. (I think we can all understand that.)
I'm very much in love and getting married to someone who has a plethora of friends like these. (I come from a family that would drop dead at a beard like that.) It's been an experience to say the least.
Does she have a right to be nervous at what others think? OF COURSE she does.
Does she have a right to suggest he get his beard professionally brushed/braided, (what the heck do you do with a beard like that?) before the wedding, just like she expects her bridesmaids to get their hair done? Of course.
Does she have a right to ask him to cut it, or ask her fiance to kick him out for his looks? NO. She was never really suggesting that in the main question.
We live in a very looks oriented society. It's normal to think someone might judge her because of her best man. It's a class issue- it really is. (Although? The boss at a former employer was a hardcore biker and a businessman.) -He was awesome.
Lay off- people. She just wants her day, without judgement. (Do you think she'd want her fiance to be unhappy that he can't have his friend there?) No. She just wants what she imagined. And although this is reality and not fairytale, she should feel comfortable on her wedding day.